Threaded member.



-S. W. PARSONS.

THREADED MEMBER.

APPLICATION FILED SEPT. 22, 1914.

1 03,546. v Patented Oct. 31, 1916.

W I TNESSES:

IN V EN TOR. Stuari W Parsona:

f my ATTORNEY.

UNITED STATES PATENT oEErcE. STUART W. .PARSONS, OF NEW BRITAIN,CONNECTICUT, ASSIGNOR TO THE STANLEY WORKS, OF NEW BRITAIN, CONNECTICUT,A CORPORATION CONNECTICUT.

THREADED MEMBER.

Specification of Letters Patent.

Application filed September 22, 1914. Serial No. 563,017.

To all whom/ it may concern:

Be it known that I, STUART W. PAnsoNs, a citizen of the United States,and a resident of New Britain, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inThreadedMembers, of which the following is a specification. The objectof this invention is to-provide a novel form of a threaded member, or asit possibly may better be termed, a thread substitute.

The invention is particularly adapted for use in connection with partsmade from sheet metal, and which it is desired to secure bythreaded'connection. The invention is adapted for use either as the\male or female member of a threaded connection, and the complementarypart is preferably of the usual continuous screw thread type.

In the drawings-Figure 1 shows the invention embodied in the femalemember of a threaded connection. Fig. 2 shows it embodied in the malemember. Fig. 3 shows a flat sheet metal blank prepared ready to berolledinto tubular shape.

The invention consists in' providing a plain tubular member with aseries of spirally arranged projections, the distance between theadjacent convolutions corresponding to the pitch ofthe threaded portionof the complementary member.

The invention will be described as applied to a member made from sheetmetal and by reference to Fig. 3 it will be seen that a sheet of metalis selected of proper width so that when rolled into tubular form itwill have the proper diameter. Into this sheet near one end andtransversely thereof,

there are formed several rows of small rounded projections and in sucharrangement with respect to one another that when the sheet is rolledinto tubular form these projections will have a spiral arrangement onthe cylinder, extending either outwardly or inwardly, depending uponwhether the member is to be used as a male or female part. As theinvention has been practised only one member of the threaded connectionhas been formed in this way, the other being the usual continuous screwthread type.

In Fig. 1, a denotes a tubular member made in accordance with myinvention, and 7) denotes the projections which in this case are on theinterior of the cylinder, constituting this member a female part. 0denotes the complementary male part, which as shown is of the usualcontinuous screw thread type. 1

In Fig. 2, the member formedin accordance with this invention is of themale type,

Patented Oct. 31, 1916.

the projections I) beingon the outside, and

the complementary member 0 being the female member.

In Fig.- 3, the flat sheet metal blank will be seen, provided with theprojections b, and ready to be rolled-up into tubular form.

It is to be noted that the projections b are substantially hemisphericalso that binding or cutting action of assembled parts will beentirelyeliminated when the member a has the projections 'b threaded lionto thethreads of the complementary memer -c. v

In accordance with this invention an eX- tremely simple and inexpensiveform of a threaded member is provided, which may be accurately fitted toany x complementary threaded member and form an extremely eflicientconnection therewith. The invention can be used with solid materialseither by casting or punching the projections, but finds its greatestutility. in connection with sheet material, since the thread equivalentcan be formed while the metal is fiat by a simple punching or rollingoperation, and

the fiat metal then be rolled to shape without distorting the threadequivalent in any manner. A

I am aware that the invention is susceptible of various embodiments andI do not wish it to be understood that the invention is limited eitherto the material to be employed or .t'ovthe manner of forming the threadequivalent. I claim as my invention A coupling including athreadedfmember,

and a member provided with a plurality of spirally arranged projectionsoperativelyassociated with the screw threads, the projections being ofeven height throughout and substantially hemispherical to eliminatebinding and cutting action of the parts.

' STUART W. PARSONS.

